Handles receiving new packets which are sent to either request or
response processing.

Signed-off-by: Kamal Heib <kam...@mellanox.com>
Signed-off-by: Amir Vadai <am...@mellanox.com>
Reviewed-by: Haggai Eran <hagg...@mellanox.com>
---
 drivers/staging/rxe/rxe_recv.c | 371 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 371 insertions(+)
 create mode 100644 drivers/staging/rxe/rxe_recv.c

diff --git a/drivers/staging/rxe/rxe_recv.c b/drivers/staging/rxe/rxe_recv.c
new file mode 100644
index 0000000..0944442
--- /dev/null
+++ b/drivers/staging/rxe/rxe_recv.c
@@ -0,0 +1,371 @@
+/*
+ * Copyright (c) 2015 Mellanox Technologies Ltd. All rights reserved.
+ * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *     - Redistributions of source code must retain the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer.
+ *
+ *     - Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/skbuff.h>
+
+#include "rxe.h"
+#include "rxe_loc.h"
+
+static int check_type_state(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
+                           struct rxe_qp *qp)
+{
+       if (unlikely(!qp->valid))
+               goto err1;
+
+       switch (qp_type(qp)) {
+       case IB_QPT_RC:
+               if (unlikely((pkt->opcode & IB_OPCODE_RC) != 0)) {
+                       pr_warn_ratelimited("bad qp type\n");
+                       goto err1;
+               }
+               break;
+       case IB_QPT_UC:
+               if (unlikely(!(pkt->opcode & IB_OPCODE_UC))) {
+                       pr_warn_ratelimited("bad qp type\n");
+                       goto err1;
+               }
+               break;
+       case IB_QPT_UD:
+       case IB_QPT_SMI:
+       case IB_QPT_GSI:
+               if (unlikely(!(pkt->opcode & IB_OPCODE_UD))) {
+                       pr_warn_ratelimited("bad qp type\n");
+                       goto err1;
+               }
+               break;
+       default:
+               pr_warn_ratelimited("unsupported qp type\n");
+               goto err1;
+       }
+
+       if (pkt->mask & RXE_REQ_MASK) {
+               if (unlikely(qp->resp.state != QP_STATE_READY))
+                       goto err1;
+       } else if (unlikely(qp->req.state < QP_STATE_READY ||
+                       qp->req.state > QP_STATE_DRAINED))
+                       goto err1;
+
+       return 0;
+
+err1:
+       return -EINVAL;
+}
+
+static void set_bad_pkey_cntr(struct rxe_port *port)
+{
+       spin_lock_bh(&port->port_lock);
+       port->attr.bad_pkey_cntr = min((u32)0xffff,
+                                      port->attr.bad_pkey_cntr + 1);
+       spin_unlock_bh(&port->port_lock);
+}
+
+static void set_qkey_viol_cntr(struct rxe_port *port)
+{
+       spin_lock_bh(&port->port_lock);
+       port->attr.qkey_viol_cntr = min((u32)0xffff,
+                                       port->attr.qkey_viol_cntr + 1);
+       spin_unlock_bh(&port->port_lock);
+}
+
+static int check_keys(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
+                     u32 qpn, struct rxe_qp *qp)
+{
+       int i;
+       int found_pkey = 0;
+       struct rxe_port *port = &rxe->port[pkt->port_num - 1];
+       u16 pkey = bth_pkey(pkt);
+
+       pkt->pkey_index = 0;
+
+       if (qpn == 1) {
+               for (i = 0; i < port->attr.pkey_tbl_len; i++) {
+                       if (pkey_match(pkey, port->pkey_tbl[i])) {
+                               pkt->pkey_index = i;
+                               found_pkey = 1;
+                               break;
+                       }
+               }
+
+               if (!found_pkey) {
+                       pr_warn_ratelimited("bad pkey = 0x%x\n", pkey);
+                       set_bad_pkey_cntr(port);
+                       goto err1;
+               }
+       } else if (qpn != 0) {
+               if (unlikely(!pkey_match(pkey,
+                                        port->pkey_tbl[qp->attr.pkey_index]
+                                       ))) {
+                       pr_warn_ratelimited("bad pkey = 0x%0x\n", pkey);
+                       set_bad_pkey_cntr(port);
+                       goto err1;
+               }
+               pkt->pkey_index = qp->attr.pkey_index;
+       }
+
+       if ((qp_type(qp) == IB_QPT_UD || qp_type(qp) == IB_QPT_GSI) &&
+           qpn != 0 && pkt->mask) {
+               u32 qkey = (qpn == 1) ? GSI_QKEY : qp->attr.qkey;
+
+               if (unlikely(deth_qkey(pkt) != qkey)) {
+                       pr_warn_ratelimited("bad qkey, got 0x%x expected 0x%x 
for qpn 0x%x\n",
+                               deth_qkey(pkt), qkey, qpn);
+                       set_qkey_viol_cntr(port);
+                       goto err1;
+               }
+       }
+
+       return 0;
+
+err1:
+       return -EINVAL;
+}
+
+static int check_addr(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
+                     struct rxe_qp *qp)
+{
+       struct sk_buff *skb = PKT_TO_SKB(pkt);
+
+       if (qp_type(qp) != IB_QPT_RC && qp_type(qp) != IB_QPT_UC)
+               goto done;
+
+       if (unlikely(pkt->port_num != qp->attr.port_num)) {
+               pr_warn_ratelimited("port %d != qp port %d\n",
+                       pkt->port_num, qp->attr.port_num);
+               goto err1;
+       }
+
+       if (skb->protocol == htons(ETH_P_IP)) {
+               struct in_addr *saddr =
+                       &qp->pri_av.sgid_addr._sockaddr_in.sin_addr;
+               struct in_addr *daddr =
+                       &qp->pri_av.dgid_addr._sockaddr_in.sin_addr;
+
+               if (ip_hdr(skb)->daddr != saddr->s_addr) {
+                       pr_warn_ratelimited("dst addr %pI4 != qp source addr 
%pI4\n",
+                                           &ip_hdr(skb)->saddr,
+                                           &saddr->s_addr);
+                       goto err1;
+               }
+
+               if (ip_hdr(skb)->saddr != daddr->s_addr) {
+                       pr_warn_ratelimited("source addr %pI4 != qp dst addr 
%pI4\n",
+                                           &ip_hdr(skb)->daddr,
+                                           &daddr->s_addr);
+                       goto err1;
+               }
+
+       } else if (skb->protocol == htons(ETH_P_IPV6)) {
+               struct in6_addr *saddr =
+                       &qp->pri_av.sgid_addr._sockaddr_in6.sin6_addr;
+               struct in6_addr *daddr =
+                       &qp->pri_av.dgid_addr._sockaddr_in6.sin6_addr;
+
+               if (memcmp(&ipv6_hdr(skb)->daddr, saddr, sizeof(*saddr))) {
+                       pr_warn_ratelimited("dst addr %pI6 != qp source addr 
%pI6\n",
+                                           &ipv6_hdr(skb)->saddr, saddr);
+                       goto err1;
+               }
+
+               if (memcmp(&ipv6_hdr(skb)->saddr, daddr, sizeof(*daddr))) {
+                       pr_warn_ratelimited("source addr %pI6 != qp dst addr 
%pI6\n",
+                                           &ipv6_hdr(skb)->daddr, daddr);
+                       goto err1;
+               }
+       }
+
+done:
+       return 0;
+
+err1:
+       return -EINVAL;
+}
+
+static int hdr_check(struct rxe_pkt_info *pkt)
+{
+       struct rxe_dev *rxe = pkt->rxe;
+       struct rxe_port *port = &rxe->port[pkt->port_num - 1];
+       struct rxe_qp *qp = NULL;
+       u32 qpn = bth_qpn(pkt);
+       int index;
+       int err;
+
+       if (unlikely(bth_tver(pkt) != BTH_TVER)) {
+               pr_warn_ratelimited("bad tver\n");
+               goto err1;
+       }
+
+       if (qpn != IB_MULTICAST_QPN) {
+               index = (qpn == 0) ? port->qp_smi_index :
+                       ((qpn == 1) ? port->qp_gsi_index : qpn);
+               qp = rxe_pool_get_index(&rxe->qp_pool, index);
+               if (unlikely(!qp)) {
+                       pr_warn_ratelimited("no qp matches qpn 0x%x\n", qpn);
+                       goto err1;
+               }
+
+               err = check_type_state(rxe, pkt, qp);
+               if (unlikely(err))
+                       goto err2;
+
+               err = check_addr(rxe, pkt, qp);
+               if (unlikely(err))
+                       goto err2;
+
+               err = check_keys(rxe, pkt, qpn, qp);
+               if (unlikely(err))
+                       goto err2;
+       } else {
+               if (unlikely((pkt->mask & RXE_GRH_MASK) == 0)) {
+                       pr_warn_ratelimited("no grh for mcast qpn\n");
+                       goto err1;
+               }
+       }
+
+       pkt->qp = qp;
+       return 0;
+
+err2:
+       if (qp)
+               rxe_drop_ref(qp);
+err1:
+       return -EINVAL;
+}
+
+static inline void rxe_rcv_pkt(struct rxe_dev *rxe,
+                              struct rxe_pkt_info *pkt,
+                              struct sk_buff *skb)
+{
+       if (pkt->mask & RXE_REQ_MASK)
+               rxe_resp_queue_pkt(rxe, pkt->qp, skb);
+       else
+               rxe_comp_queue_pkt(rxe, pkt->qp, skb);
+}
+
+static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)
+{
+       struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
+       struct rxe_mc_grp *mcg;
+       struct sk_buff *skb_copy;
+       struct rxe_mc_elem *mce;
+       struct rxe_qp *qp;
+       union ib_gid dgid;
+       int err;
+
+       if (skb->protocol == htons(ETH_P_IP))
+               ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
+                                      (struct in6_addr *)&dgid);
+       else if (skb->protocol == htons(ETH_P_IPV6))
+               memcpy(&dgid, &ipv6_hdr(skb)->daddr, sizeof(dgid));
+
+       /* lookup mcast group corresponding to mgid, takes a ref */
+       mcg = rxe_pool_get_key(&rxe->mc_grp_pool, &dgid);
+       if (!mcg)
+               goto err1;      /* mcast group not registered */
+
+       spin_lock_bh(&mcg->mcg_lock);
+
+       list_for_each_entry(mce, &mcg->qp_list, qp_list) {
+               qp = mce->qp;
+               pkt = SKB_TO_PKT(skb);
+
+               /* validate qp for incoming packet */
+               err = check_type_state(rxe, pkt, qp);
+               if (err)
+                       continue;
+
+               err = check_keys(rxe, pkt, bth_qpn(pkt), qp);
+               if (err)
+                       continue;
+
+               /* if *not* the last qp in the list
+                  make a copy of the skb to post to the next qp */
+               skb_copy = (mce->qp_list.next != &mcg->qp_list) ?
+                               skb_clone(skb, GFP_KERNEL) : NULL;
+
+               pkt->qp = qp;
+               rxe_add_ref(qp);
+               rxe_rcv_pkt(rxe, pkt, skb);
+
+               skb = skb_copy;
+               if (!skb)
+                       break;
+       }
+
+       spin_unlock_bh(&mcg->mcg_lock);
+
+       rxe_drop_ref(mcg);      /* drop ref from rxe_pool_get_key. */
+
+err1:
+       if (skb)
+               kfree_skb(skb);
+}
+
+/* rxe_rcv is called from the interface driver */
+int rxe_rcv(struct sk_buff *skb)
+{
+       int err;
+       struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
+       struct rxe_dev *rxe = pkt->rxe;
+
+       pkt->offset = 0;
+
+       if (unlikely(skb->len < pkt->offset + RXE_BTH_BYTES))
+               goto drop;
+
+       pkt->opcode = bth_opcode(pkt);
+       pkt->psn = bth_psn(pkt);
+       pkt->qp = NULL;
+       pkt->mask |= rxe_opcode[pkt->opcode].mask;
+
+       if (unlikely(skb->len < header_size(pkt)))
+               goto drop;
+
+       err = hdr_check(pkt);
+       if (unlikely(err))
+               goto drop;
+
+       if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN))
+               rxe_rcv_mcast_pkt(rxe, skb);
+       else
+               rxe_rcv_pkt(rxe, pkt, skb);
+
+       return 0;
+
+drop:
+       if (pkt->qp)
+               rxe_drop_ref(pkt->qp);
+
+       kfree_skb(skb);
+       return 0;
+}
+EXPORT_SYMBOL(rxe_rcv);
-- 
1.8.3.1

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